﻿using System;
using System.Text.RegularExpressions;

namespace CommonUtil.Common.Helpers
{
    /// <summary>
    /// 常用验证帮助类
    /// </summary>
    public static class ValidateHelper
    {
        //邮件正则表达式
        private static Regex _emailregex = new Regex(@"^[a-z0-9]([a-z0-9]*[-_]?[a-z0-9]+)*@([a-z0-9]*[-_]?[a-z0-9]+)+[\.][a-z]{2,3}([\.][a-z]{2})?$", RegexOptions.IgnoreCase);

        //手机号正则表达式
        private static Regex _mobileregex = new Regex("^1[3-9][0-9]{9}$");

        //固话号正则表达式
        private static Regex _phoneregex = new Regex(@"^(\d{3,4}-?)?\d{7,8}$");

        //IP正则表达式
        private static Regex _ipregex = new Regex(@"^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$");

        //日期正则表达式
        private static Regex _dateregex = new Regex(@"(\d{4})[-,/](\d{1,2})[-,/](\d{1,2})");

        //数值(包括整数和小数)正则表达式
        private static Regex _numericregex = new Regex(@"^[-]?[0-9]+(\.[0-9]+)?$");

        //邮政编码正则表达式
        private static Regex _zipcoderegex = new Regex(@"^\d{6}$");

        /// <summary>
        /// 是否为邮箱名
        /// </summary>
        public static bool IsEmail(string s)
        {
            if (string.IsNullOrEmpty(s))
            {
                return false;
            }
            return _emailregex.IsMatch(s);
        }

        /// <summary>
        /// 是否为手机号
        /// </summary>
        public static bool IsMobile(string s)
        {
            if (string.IsNullOrEmpty(s))
            {
                return false;
            }
            return _mobileregex.IsMatch(s);
        }

        /// <summary>
        /// 是否为固话号
        /// </summary>
        public static bool IsPhone(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return false;
            }
            return _phoneregex.IsMatch(str);
        }

        /// <summary>
        /// 是否为IP
        /// </summary>
        public static bool IsIP(string s)
        {
            return _ipregex.IsMatch(s);
        }

        /// <summary>
        /// 是否是身份证号
        /// </summary>
        public static bool IsIdCard(string id)
        {
            if (string.IsNullOrEmpty(id))
            {
                return false;
            }
            if (id.Length == 18)
            {
                return CheckIDCard18(id);
            }
            else if (id.Length == 15)
            {
                return CheckIDCard15(id);
            }
            return false;
        }

        /// <summary>
        /// 是否为18位身份证号
        /// </summary>
        private static bool CheckIDCard18(string Id)
        {
            long n = 0;
            if (long.TryParse(Id.Remove(17), out n) == false || n < Math.Pow(10, 16) || long.TryParse(Id.Replace('x', '0').Replace('X', '0'), out n) == false)
            {
                return false;//数字验证
            }

            var address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove(2)) == -1)
            {
                return false;//省份验证
            }

            var birth = Id.Substring(6, 8).Insert(6, "-").Insert(4, "-");
            var time = new DateTime();
            if (DateTime.TryParse(birth, out time) == false)
                return false;//生日验证

            var arrVarifyCode = ("1,0,x,9,8,7,6,5,4,3,2").Split(',');
            var Wi = ("7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2").Split(',');
            var Ai = Id.Remove(17).ToCharArray();
            var sum = 0;
            for (var i = 0; i < 17; i++)
            {
                sum += int.Parse(Wi[i]) * int.Parse(Ai[i].ToString());
            }

            var y = sum % 11;
            if (arrVarifyCode[y] != Id.Substring(17, 1).ToLower())
            {
                return false;//校验码验证
            }

            return true;//符合GB11643-1999标准
        }

        /// <summary>
        /// 是否为15位身份证号
        /// </summary>
        private static bool CheckIDCard15(string Id)
        {
            long n = 0;
            if (long.TryParse(Id, out n) == false || n < Math.Pow(10, 14))
            {
                return false;//数字验证
            }

            var address = "11x22x35x44x53x12x23x36x45x54x13x31x37x46x61x14x32x41x50x62x15x33x42x51x63x21x34x43x52x64x65x71x81x82x91";
            if (address.IndexOf(Id.Remove(2)) == -1)
            {
                return false;//省份验证
            }

            var birth = Id.Substring(6, 6).Insert(4, "-").Insert(2, "-");
            if (DateTime.TryParse(birth, out _) == false)
            {
                return false;//生日验证
            }

            return true;//符合15位身份证标准
        }

        /// <summary>
        /// 是否为日期
        /// </summary>
        public static bool IsDate(string str)
        {
            if (string.IsNullOrEmpty(str))
            {
                return false;
            }
            return _dateregex.IsMatch(str);
        }

        /// <summary>
        /// 是否是数值(包括整数和小数)
        /// </summary>
        public static bool IsNumeric(string numericStr)
        {
            if (string.IsNullOrEmpty(numericStr))
            {
                return false;
            }
            return _numericregex.IsMatch(numericStr);
        }

        /// <summary>
        /// 是否为邮政编码
        /// </summary>
        public static bool IsZipCode(string s)
        {
            if (string.IsNullOrEmpty(s))
            {
                return _zipcoderegex.IsMatch(s);
            }
            return false;
        }

        /// <summary>
        /// 是否是图片文件名
        /// </summary>
        /// <returns> </returns>
        public static bool IsImgFileName(string fileName)
        {
            if (!string.IsNullOrEmpty(fileName))
            {
                if (fileName.IndexOf(".") != -1)
                {
                    var tempFileName = fileName.Trim().ToLower();
                    var extension = tempFileName.Substring(tempFileName.LastIndexOf("."));
                    return extension == ".png" || extension == ".bmp" || extension == ".jpg" || extension == ".jpeg" || extension == ".gif";
                }
            }
            return false;
        }
    }
}
